Kusuma, E. P., A. N. Naysilla, and B. D. Yulianto. “SmartNotes Encrypted With Hybrid Cryptography Combining Rivest Cipher 4 and XChaCha20”. JEECS (Journal of Electrical Engineering and Computer Sciences), vol. 10, no. 2, Dec. 2025, pp. 142-51, doi:10.54732/jeecs.v10i2.5.